Hi, For me it would be hard to say because all my life I have moved from one hobby to another. I call this a 'progression,' or the learning experiences of life for me personally.
Used to be involved in the 'muscle car craze' back in the late '60s and ealry '70s. When I found myself sort of 'outgrowing' this, I went into guns, loading ammunition, etc. After a few years that became boring and then went into the hobby of 'buckshinning' or re-creating the clothes and other items used on the American frontier during the colonial era. Then, as I grew older, I gravitated from that back into the modeling experience that I used to do as a kid.
After this, if there is another change in my life, I couldn't say at the moment what it would be. I've always enjoyed reading and esp. the reading of history on the Am. Civil War, W.W.II, and Native Americn history, their religion, and lifeways all thoughout my life, which I would have to say is the only hobby that has more or less endured through time, and I look on modeling as just a 3-dimension extension of the W.W. II period of learning.
So as far as anything new on the horizon, that may come along to replace this hobby, I guess only time will tell.
Take care and good luck to you all, Sgirty